*{
    margin: 0;
    padding: 0;
    border: 0;
}
body{
    padding: 20px;
}

hr{
    border: 1px solid;
    border-width: 2px;
    color: green;
    margin: 10px 0;
}

.animation{
    display: block;
    width: 100px;
    height: 100px;
    border:1px solid red;
}